Text Diff Checker
Paste two versions of a text and see exactly which lines were added, removed or unchanged — nothing is uploaded anywhere.
How to compare two texts
- Paste the original text in the first box.
- Paste the changed version in the second box.
- Tap Compare — removed lines show in red, added lines in green.
Frequently asked questions
How does the comparison work?
It uses the classic longest-common-subsequence algorithm — the same approach tools like Git use for diffs — applied line by line, entirely in your browser.
Does it compare word by word?
No, line by line. If a single word changes inside a line, that whole line shows as removed and re-added. For prose, putting each sentence on its own line gives more readable results.
Is there a size limit?
Very large texts (millions of line combinations) are declined with a clear message instead of freezing your browser — split them into sections and compare those.